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@inproceedings{england:ipac2021-thpab220,
author = {R.J. England and K.L.F. Bane and M. Borland and Z. Li and A. Lunin and T.O. Raubenheimer and M.D. Woodley},
% author = {R.J. England and K.L.F. Bane and M. Borland and Z. Li and A. Lunin and T.O. Raubenheimer and others},
% author = {R.J. England and others},
title = {{Multibunch Studies for LCLS-II High Energy Upgrade}},
booktitle = {Proc. IPAC'21},
pages = {4219--4222},
eid = {THPAB220},
language = {english},
keywords = {cavity, dipole, linac, emittance, HOM},
venue = {Campinas, SP, Brazil},
series = {International Particle Accelerator Conference},
number = {12},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {08},
year = {2021},
issn = {2673-5490},
isbn = {978-3-95450-214-1},
doi = {10.18429/JACoW-IPAC2021-THPAB220},
url = {https://jacow.org/ipac2021/papers/thpab220.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-THPAB220},
abstract = {{The Linac Coherent Light Source (LCLS) X-ray free-electron laser at SLAC is being upgraded to LCLS-II with a superconducting linac and 1 MHz bunch repetition rate. The proposed high-energy upgrade (LCLS-II-HE) will increase the beam energy from 4 to 8 GeV, extending the reach of accessible X-ray photon energies. With the increased repetition rate and longer linac of LCLS-II-HE, multi-bunch effects are of greater concern. We use recently introduced capabilities in the beam transport code ELEGANT to study dipole and monopole beam breakup effects for LCLS-II HE beam parameters. The results indicate that resonant dipole kicks have steady-state settle times on the order of 500 bunches or less and appear manageable. We also consider a statistical variation of the cavity frequencies and transverse offsets of cavities and quadrupoles. Resonant emittance growth driven by monopole kicks is found to be disrupted by frequency variation between cavities.}},
}